Connector.



H. A. DOUGLAS.

' cowwmog APPLICATION FILED MAY 22. I914.

Patented Mar. 6, 1917 ififisaefi: 1750 w Eat/y azaagfag mounting is provided with an HARRY A. DOUGLAS, OF BRONSON,

MICHIGAN. ASSIGNOR TO DOUGLAS & RUDD MANU' FACTURING COMPANY, OF BRONSON, MICHIGAN, A CORPORATION OF MICHIGAN.

CONNECTOR. I

Specification of Letters Patent.

Patented Mar. {5, i311.

Application filed May 22, 1914. Serial No. 840,151.

To all whom it may concern:

Be it known that I. llainn' A. l)0('GLAS, citizen of the United States, residing at Bronson. in the county of Branch and State of 'Michigan, have invented a certain new andfuseful Improvement in Connectors, of which the following is'a full. clear, concise, and-exact description, reference being had to the accompanyin drawings, forming a part of this specification;

My invention relates to connectors and is of particular service when employed for cf fecting' circuit connection between the lightinglnilli'skif reflecting lamps and the source of current for such lamps, though'the invention is not to be limited to such an adaptation. The back of the lamp or other opening within which a shell is received. one end of this shell being exteriorly threaded and the other end being constructed for the reception of and interengagement with a contact carrying plu This shell has a shoulder, preferably in the form of an annular head, at an intermediate portion thereof and in engagement withone side of the mounting adjacent'the aforesaid opening. An annular cap is threaded upon the threaded end of the shelland engages the other side of said mounting adjacent said opening whereby theshell and mounting are assembled. A contact carrier extends "through said cap and into the bore of said shell and is movable longitudinally of the shell,.-this contactcarrier havin' an outer and an inner shoulder. A coil spring is interp sed between the inner shoulder and the inner side of the cap and operates to press the outer shoulder inwardly toward the cap.

The preferred form of my invention is shown in the accompanying drawing in which Figure 1 is a sectional elevation of the device of my with parts of a lamp structure in connection witli which the device of the invention The lamp reflector 1 and the lamp back 2 (that constitutes a mounting for the connector) are held in assembly by means of a invention in conjunction shell or sleeve 3, constituting the preferred form of lamp holder. that, has a flange lengaging the central portion of the reflector at the front face thereof and a nn 5 engaging the central portion of the back 2 6* at the back face thereof, this nut having threaded engagement with the threaded rearwardly projected end of the shell or sleevp 3. The shell is prevented from turnin with respect to the reflector l and back 6 2 by means of a fin 5 received in a slot in thereflector. The incandescent electric lamp 7 is illustrated as being of the single pole variety, one terminal of the filament 8 being grounded in the lamp base-sheath 9 79 while the other terminal 10 is centrally disposed. Metallic lmyonet pins ll are secured directly to the sheath '9 and are adapted for reception within bayonet slots 112 provided in opposite sides of a sleeveli-l, this sleeve constituting a part of the lamp mounting and within which sleeve the lamp may he turned to mount and demount the lamp. The contact 14 is shown as being in threaded connection with the interior of av cylindrical contact 15 which, in turZi, is in threaded connection with the in 'ulating body of the floating; contact carrier 16. An aperture is formed in a side of the cylindrical contact 15 adjacent the base of this 35 contact and through which aperture a conducting wire 17 is passed laterally into the contact carrier, the contact l-l being pressed into engagement with the conductor '17 by turning! this contact with a screw driver 96 whereby'the conductor 17 is effectively ex tended into connection with the contact 15. l'n the device of the invention there is employed a terminal 18 for the outer end of the conducting wire 17, this terminal hav ing an axial bore extending entirely through the same and receiving. substantially throughout its length. the adjacent end of the conductor 17. The conductor 17 and the terminal 18 are established in firm me- 100 chanical and electrical union by means of a small body of solder 1.) applied to the extreme end of the conductor 17 and the surrounding portion of the terminal 18 to constitute a dip soldered joint. By this const'rnction the wire cannot bend at the soldered joint so that said joint is guarded against injury and breakage. The cor. ductorcover l7 enters and snugly lits the enlargement of the here of the terminal 18 He to prevent bending and breaking of the conductor at the rear of the terminal. The terminal 18 is reduced in diameter throughout a considerable portion of its length -whereby said terminal is caused to have a shouldered formation. the shoulder portion of the terminal engaging the insetting flange 20 that is provided upon the sleeve 21 of insulating material that constitutes a contact carrier. the portions of the bore in the sleeve 21 upon both sides ot' the [hinge 20 being de sirably of substantially the same diameter. The reduced portion of the terminal 18 is threaded and a cdntact cap 22 is threaded upon this redut-ed terminal portion. this cap having a screw driver slot 23 by which it may be turned upon the terminal to bring the cap and the larger portion ot the terminal into clamping enfnxgement with the flange 20 whereby the insulating; sleeve 21, the terminal 13 and the contact are held in fixed relation as a unit. The insulating sleeve 21 is provided with an inner shoulder that is in the torm of an outsetting flange 24 that atl'ords a seat for a thrusting coil spring 25 which is insulated from all current conducting portions of the connector. An annular metal cap 26 affords a seat for the outer end of the spring 25. this ca p being pressed by the spring against an annular outer shoulder'that is formed by a split ring 26 of wire that is received within an annular groove in the insulating sleeve. The part of the device of my invention thus lar described is completed into a connector socket by means of a connector sleeve or shell 27 which is screwed into the cap 2t). 'lVhen the connector socket is to be mounted upon the back of the lamp the aperture in the back that receives the socket is margined by an insetting rim 28 which is clampingly engaged between the cap 26 and a shoulder that is preferably in the form of an annular outsetting head 29 when the sleeve or shell 27 is screwed home. The connector plug 30 carries a single contact 31 (the device illustrated being a single pole connector though the invention is not to be limited to a connector having a single pole construction) which is to engage the contact 22 in establishing the circuit. This plugcarries a pair of bayonet pins 32 adapted for reception with in the bayonet slots 33 r'orincd in the shell 27. lVhen the hook portions of the bayonet slots receive the bayonet pins the contact 31 is forced into engagement with the contact 22 against the pressure' 'ot the spring 25, the contact 22 being moved slightlyinwardly when engagement between the contacts 22 and 31 is el'l'ected. the coil spring 27 thus maintainiinqthe contacts 22 and 31 in firm electrical connection. To facilitate the assembly oi the cap 26 and shell 27 the cap is desirably knurled.

While .l have herein shown and particularly described the preferred emhodin'ient ol my invention I do not wish to be limited to the. precise details of construction shown as changes may readily be. made without departing from the spirit of my invention. but having thus desoribed my invention 1 claim as new and desire to secure by Letters Patent the l Ollt)\\'lllL-:

The combination with a mounting provided with a shell receiving opening; ot a. shell having one ol its ends cxteriorly threade and the other (it its ends construct.- ed for the reception of and intercngageinent. with a contact carrying plug, and having a shoulder at an intermediate portion in engagement with one side of said mounting adjacent the a l'oresaid opening; an annular cap in threaded engagement with the threaded end of the shell and engaging" the other side o't said mounting" adjacent the aforesaid opening; whereby the shell and mounting are assembled: a contact carrier extending through said cap and into the bore. ol said shell and movable longitndb nally ol' the shell. this contact carrier having an outer and an inner shoulder; and a. coil spring interposed between the inner shoulde' and the inner side of the cap and operating to press the outer shoulder inwardly toward the cap.

In witness whereof, I hereunto subscribe my name this twenty-fifth day of April,

I HARRY A. DOUGLAS. Witnesses HnNnY C. Bowman, WILL M. Fos'rnn. 

